Remove use of 'IV'

draft-ietf-sframe-enc.md

@@ -103,9 +103,6 @@ The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
 BCP 14 {{!RFC2119}} {{!RFC8174}} when, and only when, they appear in all
 capitals, as shown here.
 
-IV:
-: Initialization Vector
-
 MAC:
 : Message Authentication Code
 
@@ -231,7 +228,7 @@ the parties in the conference.  Keys for SFrame might be distributed over an
 existing E2E-secure channel (see {{sender-keys}}), or derived from an E2E-secure
 shared secret (see {{mls}}).  The key management system MUST ensure that each
 key used for encrypting media is used by exactly one media sender, in order to
-avoid reuse of IVs.
+avoid reuse of nonces.
 
 ## SFrame Ciphertext
 
@@ -275,7 +272,7 @@ The SFrame header specifies two values from which encryption parameters are
 derived:
 
 * A Key ID (KID) that determines which encryption key should be used
-* A counter (CTR) that is used to construct the IV for the encryption
+* A counter (CTR) that is used to construct the nonce for the encryption
 
 Applications MUST ensure that each (KID, CTR) combination is used for exactly
 one encryption operation. A typical approach to achieving this guarantee is